Federer knocked out of US Open by Robredo

Roger Federer of Switzerland walks off the court after losing in three sets to Tommy Robredo of Spain at the US Open tennis championships in New York September 2, 2013. [Photo/Agencies]

NEW YORK - Former world number one Roger Federer was knocked out of the US Open on Monday by Spain's Tommy Robredo.

In a stunning upset, Robredo won their fourth-round match 7-6(3) 6-3 6-4 at Flushing Meadows.

It was the first time in a decade that Federer, a five-time US Open champion, had failed to make the quarter-finals in New York.

The Swiss master, who holds a record 17 grand slam titles, had his chances against Robredo but converted just two of 16 break points.